Thermo-electrical apparatus for boiling and heating purposes



J. G. LOZANO. THERMD ELECTRICAL APPARATUS FOR BOILING AND HEATINGPURPOSES. APPLICATION FILED JAN. 8. 1920 1,390,719. Pat IitedSept.13,1921.. A

f A g 7 tainer with double walls with an interme-' UNITED STATES JOAQUINGRANDE LOZANO, 0F MADRIl), SPAIN.

PATENT: OFFICE.

THERMO-ELECTRICAL APPARATUS FOR BOILING AND HEATING PURPOSES.

Specification of Iietters Patent. Patented Sept, 13, 1921.

Application filed January 8, i920. Serial No. 350,231.

To all whom it may concern.

Be it known that I, JOAQUIN GRANDE LOZANO, subject of the King of Spain,residing at Madrid, Spain, have invented certain new and usefulImprovements in Thermo-Elect-rical Apparatus for Boiling and HeatingPurposes, of which the following is a specification.

This invention relates to electrically heated utensils for industrial ordomestic' use of the type comprising an inner container bearing aresistance heating element thereon, and an outer container adapted toentirely surround the inner container, the'containers being of suchrelative diameters that an air space is provided therebetween.

It has hitherto been suggested in electric heating appliances, to applythe coils in grooves formed in an innerceramic vessel and then coatingthe coils and ad acent part of the vessel with ceramic material to forma permanent coating, the whole being adapted to closely fit into anouter container.

Accordin to the present invention, the

inner container is composed of a norr-con ductive material and hasgrooves therein to receive an electric heating winding, the whole beinginclosed in an outer container of non-conductive material of suchrelative diameter to the inner container as to allow of an air spacetherebetween.

The object of the invention is not only to form such a heating orcooking container of earthenware, but also to provide the condiate airchamber.

The invention will now be described with reference to the accompanyingdrawings in which: X

Figure 1 is an outside elevation of the inner member hereinafterdescribed without the use of any shield or protection.

The apparatus is formed of two separate jars or containers a and 1;arranged within one another and of such relative diameters that anannular air space or chamber 0 is left between them. These jars are madeof earthenware material permitting of differences of temperature betweenthe normal of the liquids to be heated orboiled and that of theelectrical resistance coil or coils for example from five to six hundreddegrees centigrade.

The exterior of the inner container is grooved as at d to receive anelectrical resistance winding (not shown) the ends thereof being securedto small projecting lugs e, by which the coil is maintained in position.The wall of the container a is of a thickness just sufficient to locatethe electrical resistance winding so that a dense screen will.

not be presented to the transmission of heat. The upper end is formedwith a pouring lip f, which is accommodated in a similar recessg in theouter container. This latter is of a diameter such that when the-innermember a, is placed therein, an air chamber 0 is formed, which isclosed, in at the top by a filling or sealing compound y held inposition by projections and grooves h on the respective members, andsuch compound may for instance be cement or otherwise. A flange Kconceals and protects the connection between the two containers.

The outer container is fitted with a handle and two electrical terminalsfor attachment in an electrical circuit, and such terminals areconnected inside to the resistance coil or coils.

The container may be made in suitable sizes and capable of holding, forexample, one-half, or a quarter liter respectively.

Having now particularly described and ascertained the nature of my saidinvention and in what manner the same is to be performed, I declare thatwhat claim is:

1. An electrically heated utensil comprising inner and outer containers,said containers being spaced apart to form an air space,

the inner surface of said outer container and the outer surface of saidinner container bein grooved adjacent the upper ends thereo a sealingcompound retained in position in said grooves, said inner containerbeing composed of non-conductive material, an electrical heating elementwound upon said inner container and having its terminals connected tosaid outer container.

2. An electrically heated utensil comprising inner andouter containers,said containers being spaced apart to form an air space, the innersurface of said outer container and the outer surface of said innercontainer being grooved adjacent the upper ends thereof. a sealingcompound retained in position in said grooves, said inner containerbeing composed of non-conductive material, an electrical heating elementWound upon said inner container and having its terminals connected tosaid outer container, said inner container being formed With aperipheral flange adapted to rest upon the upper end of said outercontainer and to cover and protect said sealing compound. In testimonywhereof Iatfix my signature.

JOAQUIN GRANDE LOZANO. Witnesses:

ELY E. PALMER,

MANUEL MARBERRY.

